US4412424A - Air conditioning system for preventing fogging of vehicle windows - Google Patents

Air conditioning system for preventing fogging of vehicle windows Download PDF

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Publication number
US4412424A
US4412424A US06/334,054 US33405481A US4412424A US 4412424 A US4412424 A US 4412424A US 33405481 A US33405481 A US 33405481A US 4412424 A US4412424 A US 4412424A
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US
United States
Prior art keywords
temperature
cooler
level
control
compressor
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US06/334,054
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English (en)
Inventor
Katumi Iida
Shinji Sutoh
Toshizo Hara
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Bosch Corp
Original Assignee
Diesel Kiki Co Ltd
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Application filed by Diesel Kiki Co Ltd filed Critical Diesel Kiki Co Ltd
Assigned to DIESEL KIKI COMPANY, LTD., A CORP. OF JAPAN reassignment DIESEL KIKI COMPANY, LTD., A CORP. OF JAPAN ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: HARA, TOSHIZO, IIDA, KATUMI, SUTOH, SHINJI
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Publication of US4412424A publication Critical patent/US4412424A/en
Assigned to ZEZEL CORPORATION reassignment ZEZEL CORPORATION CHANGE OF NAME (SEE DOCUMENT FOR DETAILS). Assignors: DIESEL KOKI CO., LTD.
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
    • B60H1/00—Heating, cooling or ventilating [HVAC] devices
    • B60H1/32—Cooling devices
    • B60H1/3204—Cooling devices using compression
    • B60H1/3205—Control means therefor
    • B60H1/321—Control means therefor for preventing the freezing of a heat exchanger
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60S—SERVICING, CLEANING, REPAIRING, SUPPORTING, LIFTING, OR MANOEUVRING OF VEHICLES, NOT OTHERWISE PROVIDED FOR
    • B60S1/00—Cleaning of vehicles
    • B60S1/02—Cleaning windscreens, windows or optical devices
    • B60S1/023—Cleaning windscreens, windows or optical devices including defroster or demisting means
    • B60S1/026—Cleaning windscreens, windows or optical devices including defroster or demisting means using electrical means

Definitions

  • the present invention relates to an air conditioning system for an automotive vehicle or the like and, more particularly, to an apparatus for controlling the air conditioning system to prevent the fogging or dimming of vehicle windows due to condensation of moisture on the window inner surfaces especially when the temperature outside the vehicle passenger compartment considerably drops in the winter. Such fogging impairs the visibility of the vehicle operator and creates a potentially dangerous situation.
  • fogging on the inner surfaces of vehicle windows can be removed by operating an evaporator of the air conditioner, i.e. the cooler, to lower the temperature inside the passenger compartment.
  • an evaporator of the air conditioner i.e. the cooler
  • a compressor drive control circuit for driving the cooler for such a specific purpose includes a series connection of an air conditioner switch connected with a power supply, a defroster switch for preventing the evaporator from being freezed, and a variable temperature sensitive switch designed to efficiently control the drive of the compressor in accordance with the varying surrounding conditions, particularly the outside temperature.
  • a magnet clutch drive coil for driving the compressor is energized by the power supply.
  • the temperature sensitive switch of the series connection is controlled in a predetermined on-off mode wherein the temperature levels at which the switch are turned on and off are individually variable with a change in the outside temperature.
  • An arrangement is made such that when the outside temperature is very low, that is, at a predetermined low level as in the winter, the temperature sensitive switch is automatically turned off to keep the compressor from operating. The result will be a favorable decrease in the operation rate of the compressor.
  • the cooler cannot be activated to remove the fog even if the air conditioner switch and defroster switch of the series connected are both turned on, due to the off state of the temperature sensitive switch.
  • An implement heretofore proposed to settle this problem comprises a variable temperature sensitive bypass switch which is connected in parallel with the above-mentioned first temperature sensitive switch of the series connection.
  • the bypass switch When the outside temperature drops beyond the predetermined low level at which the compressor becomes inoperable, the bypass switch is turned on to establish a power supply path to the magnet clutch drive coil bypassing the first temperature sensitive switch which has then been turned off. This forces the compressor into operation for clearing the vehicle windows of the fog.
  • the on and off temperature levels of the bypass switch and those of the first temperature sensitive switch involve, depending on the design, a possibility that the bypass switch is not necessarily turned on while the first temperature sensitive switch is off and, therefore, fails to activate the compressor to remove the fog.
  • the first temperature sensitive switch turns on at a temperature of 10° C. and off at a temperature of 5° C.
  • the bypass switch turns on at a temperature of 7° C. (low temperature level mentioned previously).
  • the outside temperature is 8° C. and the vehicle windows are foggy
  • the first switch remains turned off until the outside temperature rises beyond 10° C.
  • the bypass switch remains turned off until the outside temperature drops beyond 7° C.
  • the fog on the vehicle windows cannot be cleared as long as the outside temperature lies within the range of 7° C. to 10° C.
  • An air conditioning system for controlling a temperature in an enclosure embodying the present invention comprises a cooler for discharged cooled air into the enclosure, a cooler temperature sensor for sensing a temperature of the cooler, an outside temperature sensor for sensing a temperature outside the enclosure and an operation controller for turning the cooler on and off.
  • the operation controller is constructed to compute a control on temperature and a control off temperature as predetermined functions of the cooler temperature and the outside temperature. The controller functions to turn the cooler on when the cooler temperature is higher than the control on temperature and to turn the cooler off when the cooler temperature is lower than the control off temperature.
  • the controller is further constructed to change the control on and off temperatures to different levels such that the control on and off temperatures increases as the outside temperature decreases and when the outside temperature is above a first predetermined temperature, the control on and off temperatures are maintained constant at upper limits when the outside temperature is varied between the first predetermined temperature and a second predetermined temperature which is lower than the first predetermined temperature, and the control on and off temperatures decreases as the outside temperature further decreases and when the outside temperature is below the second predetermined temperature.
  • an air conditioning system for preventing the fogging of vehicle windows includes a defroster switch which is closed to turn on a compressor when the temperature at or around the surfaces of an evaporator drops down to a predetermined off mode level.
  • a defroster switch which is closed to turn on a compressor when the temperature at or around the surfaces of an evaporator drops down to a predetermined off mode level.
  • the off mode level becomes saturated to a constant (maximum) level.
  • the off mode level is progressively lowered from the maximum level to a lower level.
  • FIG. 1 is a block diagram showing a compressor drive control of a prior art automotive air conditioning system
  • FIG. 2 is a view explanatory of an operation of the compressor drive control shown in FIG. 1;
  • FIG. 2A is a view explanatory of the operation of the compressor drive control shown in FIG. 1;
  • FIG. 3 is a view demonstrating an operation of an anti-fogging apparatus for an automotive air conditioning system embodying the present invention
  • FIG. 4 is a diagram showing an electric control circuit for controlling the anti-fogging apparatus of FIG. 3;
  • FIGS. 5 and 6 are views explanatory of an operation of the control circuit shown in FIG. 4.
  • anti-fogging apparatus for an automotive air conditioning system of the present invention is susceptible of numerous physical embodiments, depending upon the environment and requirements of use, substantial numbers of the herein shown and described embodiment have been made, tested and used, and all have performed in an eminently satisfactory manner.
  • a compressor drive control associated with a prior art automotive air conditioning system comprises a series connection of an air conditioner switch SW 1 , a defroster switch SW 2 and a variable temperature sensitive switch SW 3 .
  • This series connection is connected at its one end with a power supply Ba and at its other end with a magnetic clutch drive coil CL, which is adapted to on-off control a compressor C.
  • a variable temperature sensitive bypass switch SW 4 is connected with the series circuit bypassing the switch SW 3 , that is, in parallel with the switch SW 3 .
  • the air conditioner switch SW 1 is adapted to drive the compressor C and constructed such that, when turned on, it renders the compressor C and, therefore, the cooler operative to lower the temperature inside the vehicle passenger compartment or to clear fogging from the inner surfaces of the vehicle windows.
  • the defroster switch SW 2 is turned on or off in response to an output of a temperature sensor associated with an evaporator to sense a temperature at or around the surfaces of an evaporator.
  • the state of the defroster switch SW 2 is varied according to an operation mode A shown in FIG. 2 and which has an on mode temperature level A ON at which the defroster switch SW 2 is to turn on and an off mode temperature level at which the same is to turn off.
  • the defroster switch SW 2 When the output of the evaporator temperature sensor indicates a temperature drop down to a level t 1 near 0° C., for example, the defroster switch SW 2 is turned off to deactivate the compressor C. When the sensor output represents an increase in the evaporator temperature up to a level t 2 somewhat higher than the level t 1 , the defroster switch SW 2 is turned on to activate the compressor C. Such an on-off control of the compressor C prevents the evaporator from becoming freezed.
  • the variable temperature sensitive switch SW 3 is on-off controlled as shown in FIG. 2 in accordance with operation modes B and B' which individually have off mode temperature levels B OFF and B OFF ' for turning off the switch SW 3 and on mode temperature levels B ON and B ON ' for turning on the same.
  • the on and off temperature levels B ON and B OFF of the operation mode B are predetermined to rise progressively as the temperature outside the vehicle passenger compartment drops.
  • the off mode temperature level B OFF is saturated to a given level t 3 to turn itself into the alternative off mode temperature level B OFF ' and, likewise, the on mode temperature level B ON is saturated to a given level t 5 to turn itself into the alternative on mode temperature level B ON '.
  • the operation mode B would be elevated linearly with the drop of the outside temperature to make the compressor C practically inoperable.
  • the switch SW 3 on-off controlled in this way according to the complementary modes B and B' the compressor C can be powerfully operated in the summer, for example, until the associated evaporator is about to be freezed while, in the other seasons, its operation rate can be minimized to save power.
  • variable temperature sensitive bypass switch SW 4 is employed to avoid an occurrence that, upon a drop of the outside temperature T beyond a certain predetermined level T 0 as in the winter, the temperature sensitive switch SW 3 is turned off to prevent the compressor C from being activated even when the air conditioner switch SW 1 is turned on, which would make impossible the removal of the fogging on the vehicle windows.
  • the bypass switch SW 4 is turned on to forcibly drive the compressor C while bypassing the switch SW 3 , to thereby enable the compressor C to perform its anti-fogging function.
  • the magnet clutch drive coil CL becomes controlled only by the operations of the series connected air conditioner switch SW 1 and defroster switch SW 2 to in turn control the operation of the compressor C.
  • the bypass switch SW 4 is controlled by an output of an outside temperature sensor 18 (see FIG. 4) and may be on-off controlled in an operation mode C shown in FIG. 2. In the operation mode C, the bypass switch SW 4 is turned on when the outside temperature drops beyond a level t 4 and turned off when it rises beyond a level t 6 .
  • bypass switch SW 4 remains turned off until the outside temperature drops beyond the level t 4 while the switch SW 3 remains turned off until the evaporator temperature rises from the level t 3 to the level t 5 .
  • Such states of the switches SW 3 and SW 4 overlap in the range ⁇ , preventing the compressor C from being driven for its anti-fogging operation.
  • the present invention contemplates to eliminate the drawback described hereinabove with a construction which, when the outside temperature reaches a predetermined low level, lowers the operation mode B progressively from the saturation range in proportion to the lowering outside temperature.
  • FIG. 3 there is shown the operation of an anti-fogging apparatus for an automotive air conditioning system embodying the present invention.
  • the on and off mode levels B OFF and B ON of the switch SW 3 are allowed to be elevated individually to define a power saving range X.
  • the off and on mode levels B OFF ' and B ON ' of the operation mode B' become saturated to the temperatures t 3 and t 5 , respectively, as defined by a saturation range Y.
  • the operation mode B is provided with a gradient in the anti-dewing range Z which is opposite in direction to the gradient in the power saving range X.
  • the operation rate of the compressor C is progressively incremented so that the compressor C can be turned on when the air conditioner switch SW 1 remains turned on. This succeeds in clearing the vehicle windows of the fogging or dimming.
  • This type of control eliminates the need for the conventional bypass switch and thereby simplifies the circuit arrangement. Moreover, the designing is facilitated because disproportionate precausion against the inconsistency in the characteristics of sensors is needless.
  • FIG. 4 illustrates an electric control circuit associated with the anti-fogging apparatus of the present invention.
  • the control circuit has a power supply 10 which is connected with a magnet clutch dirve coil CL via an air conditioner switch SW 1 and a variable temperature sensitive switch SW 3 , which is constituted by the contact 12a of a relay 12.
  • An inside temperature sensor 14, an insolation sensor 16 and an outside temperature sensor 18 are connected with resistors 20, 22 and 24, respectively.
  • the output of the sensors 14, 16 and 18 produced at their junctions with the corresponding resistors 20, 22 and 24 are individually coupled to the inverting input of an operational amplifier 32.
  • a temperature setting element 34 supplies its output also to the inverting input of the operational amplifier 32.
  • the non-inverting input of the operational amplifier 32 is supplied via a resistor 42 with a reference voltage E 1 which appears at the junction of resistors 38 and 40.
  • the output V 1 of the operational amplifier 32 is coupled through a resistor 44 to the non-inverting input of a second operational amplifier 46 and through a resistor 48 to the inverting input of a third operational amplifier 50.
  • the inverting input of the operational amplifier 46 is supplied with a reference voltage E 2 via a resistor 56 which appears at the junction of resistors 52 and 54
  • the non-inverting input of the operational amplifier 50 is supplied with a reference voltage E 3 via a resistor 62 which appears at the junction of resistors 58 and 60.
  • the output voltages V 2 and V 3 of the operational amplifier 46 and 50 are fed to a resistor 68 by way of diodes 64 and 66, respectively.
  • the output voltage V 4 of the resistor 68 is supplied to the cathode of a diode 70 whose anode is connected via a resistor 72 to the junction of resistors 74 and 76.
  • Produced at the junction of the resistors 74 and 76 is a voltage E 0 which is coupled through a resistor 80 to the non-inverting input of a fourth operational amplifier 78.
  • the inverting input of this operational amplifier 78 is supplied via a resistor 86 with an output of a cooler temperature sensor 84 which appears at the junction of the cooler temperature sensor 84 with a resistor 82.
  • the output of the operational amplifier 78 is fed to the base of a transistor 92 through a resistor 90, while being fed back to the non-inverting input thereof via a resistor 94.
  • the transistor 92 has its emitter grounded and connected to the relay contact 12a via a diode 94, and its collector connected to the relay 12.
  • a diode 96 is connected in parallel with the relay 12.
  • the output of the temperature setting element 34 and the outputs of the sensors 14, 16 and 18 are supplied differentially to the operational amplifier 32.
  • the output voltage V 1 of the operational amplifier 32 is increased in proportion as indicated in FIG. 5 and coupled to the operational amplifiers 46 and 50.
  • the operational amplifier 46 produces an output voltage V 2 comparing the input voltage V 1 with the reference voltage E 2 .
  • the operational amplifier 50 produces an output voltage V 3 comparing the input voltage V 1 with the reference voltage E 3 .
  • the resistor 68 is therefore supplied with a composite voltage V 4 of the voltages V 3 and V 2 .
  • a voltage V 5 across the resistors 74 and 76 and obtained from the voltage V 4 functions to maximize the voltage E 0 at the junction of the resistors 74 and 76 and, when the diode 70 is rendered conductive, to minimize the voltage at the junction of the resistor 74 and the resultant parallel connection of the resistors 72 and 76.
  • the voltage V 5 becomes saturated without being raised or lowered beyond the voltage E 0 .
  • the voltage V 5 thus having an inverted trapezoidal characteristic is supplied to the non-inverting input of the operational amplifier 78 as a reference voltage.
  • the magnet clutch drive coil CL has a generally trapezoidal characteristic in the operation mode B as shown in FIG. 6 turned on and off by the transistor 92, which is turned on and off by the varying output of the cooler temperature sensor 84.
  • the anti-fogging apparatus of the invention readily sets up the power saving range X, saturation range Y and anti-dewing range Z.
  • the compressor C With the anti-dewing range Z, the compressor C can be operated positively though the outside temperature may drop to a level near 0° C., ensuring the removal of the fogging of vehicle windows.
  • the omission of the conventional bypass switch cuts down the cost. Since it is needless to be so precautious against the irregular characteristics among sensors, such an apparatus can be designed with ease and free from malfunctions.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Air Conditioning Control Device (AREA)
  • Air-Conditioning For Vehicles (AREA)
US06/334,054 1980-12-29 1981-12-23 Air conditioning system for preventing fogging of vehicle windows Expired - Lifetime US4412424A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP55-188692 1980-12-29
JP55188692A JPS57114715A (en) 1980-12-29 1980-12-29 Car air conditioner

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US4412424A true US4412424A (en) 1983-11-01

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Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4685508A (en) * 1984-10-12 1987-08-11 Diesel Kiki Co., Ltd. Automotive air-conditioning apparatus with demist control
US4693172A (en) * 1984-12-10 1987-09-15 British Aerospace Plc Automatic mist preventing system for vehicle transparencies
US4754209A (en) * 1985-11-09 1988-06-28 Alps Electric Co., Ltd. Motor actuator
EP0208318A3 (en) * 1985-07-12 1988-10-12 Kabelwerke Reinshagen Gmbh Thermally activated electric switch for an electric load, and its use
US4821792A (en) * 1986-02-28 1989-04-18 Bayerische Motoren Werke Ag Heating and cooling system for motor vehicles
US4878358A (en) * 1987-12-01 1989-11-07 Diesel Kiki Co., Ltd. Demisting control system of air conditioner for automotive vehicles
US4910967A (en) * 1988-07-28 1990-03-27 Diesel Kiki Co., Ltd. Demist controller for automobile air-conditioners
US5191768A (en) * 1991-04-26 1993-03-09 Zexel Corporation Automobile air conditioner compressor discharge capacity controller
EP0730989A1 (de) * 1995-03-04 1996-09-11 Behr GmbH & Co. Verfahren und Schaltungsanordnung zur Ein-/Ausschaltsteuerung des Kompressors einer Kraftfahrzeug-Klimaanlage
US5572877A (en) * 1994-07-06 1996-11-12 Honda Giken Kogyo Kabushiki Kaisha Air conditioner for vehicles
EP0749858A3 (de) * 1995-06-22 1999-02-24 Bayerische Motoren Werke Aktiengesellschaft, Patentabteilung AJ-3 Betriebsverfahren zur Vermeidung einer Verdampfervereisung
US6035649A (en) * 1997-07-04 2000-03-14 Daimlerchrysler Ag Method for controlling the evaporator temperature of an air conditioner as a function of the outside dew point
US6422062B1 (en) * 2000-08-29 2002-07-23 Delphi Technologies, Inc. Integrated glass fog sensor unit
US20080178620A1 (en) * 2007-01-25 2008-07-31 Honda Motor Co., Ltd. Fan control limitation logic in auto defog system
CN108263341A (zh) * 2016-12-30 2018-07-10 郑州宇通客车股份有限公司 一种电动车及其除霜系统
CN112158166A (zh) * 2020-09-30 2021-01-01 重庆长安汽车股份有限公司 一种汽车自动除雾的控制方法及汽车

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0698891B2 (ja) * 1986-07-15 1994-12-07 株式会社ゼクセル 自動車用空調装置のデミスト制御装置

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4209994A (en) * 1978-10-24 1980-07-01 Honeywell Inc. Heat pump system defrost control
US4289272A (en) * 1978-03-31 1981-09-15 Matsushita Electric Industrial Co., Ltd. Temperature control apparatus
US4356705A (en) * 1979-08-20 1982-11-02 Diesel Kiki Company, Ltd. Vehicle temperature control apparatus

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4289272A (en) * 1978-03-31 1981-09-15 Matsushita Electric Industrial Co., Ltd. Temperature control apparatus
US4209994A (en) * 1978-10-24 1980-07-01 Honeywell Inc. Heat pump system defrost control
US4356705A (en) * 1979-08-20 1982-11-02 Diesel Kiki Company, Ltd. Vehicle temperature control apparatus

Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4685508A (en) * 1984-10-12 1987-08-11 Diesel Kiki Co., Ltd. Automotive air-conditioning apparatus with demist control
US4693172A (en) * 1984-12-10 1987-09-15 British Aerospace Plc Automatic mist preventing system for vehicle transparencies
EP0208318A3 (en) * 1985-07-12 1988-10-12 Kabelwerke Reinshagen Gmbh Thermally activated electric switch for an electric load, and its use
US4754209A (en) * 1985-11-09 1988-06-28 Alps Electric Co., Ltd. Motor actuator
US4821792A (en) * 1986-02-28 1989-04-18 Bayerische Motoren Werke Ag Heating and cooling system for motor vehicles
US4878358A (en) * 1987-12-01 1989-11-07 Diesel Kiki Co., Ltd. Demisting control system of air conditioner for automotive vehicles
US4910967A (en) * 1988-07-28 1990-03-27 Diesel Kiki Co., Ltd. Demist controller for automobile air-conditioners
US5191768A (en) * 1991-04-26 1993-03-09 Zexel Corporation Automobile air conditioner compressor discharge capacity controller
US5572877A (en) * 1994-07-06 1996-11-12 Honda Giken Kogyo Kabushiki Kaisha Air conditioner for vehicles
EP0730989A1 (de) * 1995-03-04 1996-09-11 Behr GmbH & Co. Verfahren und Schaltungsanordnung zur Ein-/Ausschaltsteuerung des Kompressors einer Kraftfahrzeug-Klimaanlage
US5826439A (en) * 1995-03-04 1998-10-27 Behr Gmbh & Co. Method and circuit for on/off control of the compressor of a motor vehicle air conditioner
EP0749858A3 (de) * 1995-06-22 1999-02-24 Bayerische Motoren Werke Aktiengesellschaft, Patentabteilung AJ-3 Betriebsverfahren zur Vermeidung einer Verdampfervereisung
US6035649A (en) * 1997-07-04 2000-03-14 Daimlerchrysler Ag Method for controlling the evaporator temperature of an air conditioner as a function of the outside dew point
US6422062B1 (en) * 2000-08-29 2002-07-23 Delphi Technologies, Inc. Integrated glass fog sensor unit
US20080178620A1 (en) * 2007-01-25 2008-07-31 Honda Motor Co., Ltd. Fan control limitation logic in auto defog system
US7845182B2 (en) 2007-01-25 2010-12-07 Honda Motor Co., Ltd. Fan control limitation logic in auto defog system
CN108263341A (zh) * 2016-12-30 2018-07-10 郑州宇通客车股份有限公司 一种电动车及其除霜系统
CN112158166A (zh) * 2020-09-30 2021-01-01 重庆长安汽车股份有限公司 一种汽车自动除雾的控制方法及汽车
CN112158166B (zh) * 2020-09-30 2023-03-28 重庆长安汽车股份有限公司 一种汽车自动除雾的控制方法及汽车

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Publication number Publication date
JPS57114715A (en) 1982-07-16
JPS6225522B2 (enrdf_load_stackoverflow) 1987-06-03

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